<template>
    <div>
        <!-- 面包屑导航区域 -->
            <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>权限管理</el-breadcrumb-item>
    <el-breadcrumb-item>角色列表</el-breadcrumb-item>
            </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row 
                        :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
                        v-for="(item1, i1) in scope.row.children" :key="item1.id">
                        <!-- 渲染一级权限 -->
                        <el-col :span="5">
                            <el-tag
                            closable
                            @close="removeRightById(scope.row,item1.id)"
                            >{{item1.authName}}</el-tag>
                            <i class="el-icon-caret-right"></i>
                        </el-col>
                        <!-- 渲染二级和三级权限 -->
                        <el-col :span="19">
                            <!-- 通过 for 循环 嵌套渲染二级权限 -->
                            <el-row 
                            :class="[i2 === 0 ? '' : 'bdtop','vcenter']"
                            v-for="(item2, i2) in item1.children" :key="item2.id">
                                <el-col :span="6">
                                    <el-tag type="success"
                                    closable
                                    @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                    <i class="el-icon-caret-right"></i>
                                </el-col>
                                <el-col :span="18">
                                    <el-tag 
                                    type="warning"
                                    v-for="(item3, i3) in item2.children" 
                                    :key="item3.id"
                                    closable
                                    @close="removeRightById(scope.row,item3.id)">
                                        {{item3.authName}}
                                    </el-tag>
                                </el-col>
                            </el-row>
                        </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini">
                            编辑
                        </el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini">
                            删除
                        </el-button>
                        <el-button type="warning" icon="el-icon-setting" size="mini"
                        @click="showSetRightDialog(scope.row)">
                            分配权限
                        </el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->
        
<el-dialog
    title="分配权限"
    :visible.sync="setRightDialogVisible"
    width="60%"
    @close="setRightDialogClosed">
    <!-- 树形控件区 -->
    <el-tree :data="rightslist" 
    :props="treeProps" 
    show-checkbox
    node-key="id"
    default-expand-all
    :default-checked-keys="defKeys"
    ref="treeRef">
    </el-tree>
    <span slot="footer" class="dialog-footer">
    <el-button @click="setRightDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="allotRights">确 定</el-button>
    </span>
</el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 所有角色列表的数据
            rolelist:[],
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible:false,
            // 所有权限的数据
            rightslist:[],
            // 树形控件的绑定对象
            treeProps: {
                children: 'children',
                label:'authName'
            },
            // 默认选中的节点id值数组
            defKeys:[],
            // 当前即将分配权限的角色id
            roleId:''
        }
    },
    created() {
        this.getRolesList()
    },
    methods: {
        // 获取所有角色的列表
        async getRolesList(){
        const { data: res } =await this.$http.get('roles')

        if (res.meta.status !== 200) {
            return this.$message.error('获取角色列表失败')
        }
            this.rolelist = res.data

            console.log(this.rolelist);
        },
        // 根据id删除对应的权限
        async removeRightById(role, rightId) {
            // 弹框提示用户是否删除
        const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
        }).catch(err => err)

            if (confirmResult !== 'confirm') {
                return this.$message.info('取消删除了！')
            }
            const {data : res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if (res.meta.status !== 200) {
                return this.$message.error('删除权限失败!')
            }
            // this.getRolesList()
            role.children = res.data
        },
        // 展示分配权限的对话框
        async showSetRightDialog(role) {
            this.roleId = role.id
            // 获取所有权限的数据
            const {data: res}= await this.$http.get('rights/tree')

            if (res.meta.status !== 200) {
                return this.$message.error('获取所有权限数据失败')
            }
            // 获取到的权限数据保存到data中
            this.rightslist = res.data
            console.log(this.rightslist);

            // 递归获取三级节点的id
            this.getLeafkeys(role,
            this.defKeys)

            this.setRightDialogVisible = true
        },
        // 通过递归的形式，获取角色下所有的三级权限的id，并保存到defKeys数组中
        getLeafkeys(node, arr) {
            //   如果当前node节点不包含children属性，则是三级节点
            if (!node.children) {
                return arr.push(node.id)
            }

            node.children.forEach(item =>
            this.getLeafkeys(item,arr))
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed() {
            this.defKeys = []
        },
        // 点击为角色分配权限
        async allotRights() {
            const keys = [
                ...this.$refs.treeRef.
                getCheckedKeys(),
                ...this.$refs.treeRef.
                getHalfCheckedKeys()
            ]

            const idStr = keys.join(',')

            const { data : res} = await this.$http.post(`roles/${this.roleId}/rights`,
            { rids: idStr})

            if (res.meta.status !== 200) {
                return this.$message.error('分配权限失败！')
            }
            this.$message.success('分配权限成功！')
            this.getRolesList()
            this.setRightDialogVisible = false
        }
    },
}
</script>

<style lang="less" scope>
    .el-tag {
            margin: 7px;
    }
    .bdtop {
        border-top: 1px solid #eee;
    }
    .bdbottom {
        border-bottom: 1px solid #eee;
    }
    .vcenter {
    display: flex;
    align-items: center;
    }
</style>